Chapter 3: Radiation Safety

Chapter 3: Radiation Safety, Nuclear Medicine Technology Review Questions 5th Ed.pdf

Which of the following bodies regulates transportation of radiopharmaceuticals?

DOT

Which of the following bodies regulates the use of investigational pharmaceuticals?

FDA

In the event of a spill of Tc-99m to clothes, one should immediately:

Remove and store the clothes until they decay to background.

If a radiopharmaceutical is spilled on the floor, the first priority is to:

Cover the area with absorbent paper and restrict access around it

The inverse square law, in words, says:

If you double the distance from the source of activity, you reduce exposure to 25 % of the original intensity.

What is the best way to decrease the radioactive dose to visitors if a patient is surveyed to emit 3 mR/h at bedside?

Have the visitor sit or stand as far as possible from bedside

Which of the following isotopes would be effectively shielded by a plastic syringe?

Sr-89

What is the NRC annual dose limit allowed to the lens of the eye?

15 rem

Which of the following should be used when administering an intravenous pharmaceutical to a patient?

Gloves

Which of the following is the most effective means of measuring low levels of removable radiation?

By performing a wipe test

What is the dose rate limit at the package surface for a shipment of radioactive material bearing a Yellow-III label?

200 mR/h

Which of the following measures absorbed doses?

Gray

If the dose rate at 3 m from a radioactive source is 100 mrem/h, what will the dose rate be at 6 m?

25 mR/h

The philosophy of the ALARA program is to keep the radiation dose:

As low as reasonably achievable

All of the following are critical factors in keeping radiation exposure to a minimum except:

Geometry of the container holding the source of radiation

Gaseous radiopharmaceuticals may only be used in rooms that:

Are at a negative pressure compared to surrounding rooms

If the exposure rate at 4 m from a radioactive source is 5 mR/h, what will the exposure rate be at 3 m?

8.9 mR/h

A spill of Tc-99m increases the exposure rate in a room from 1.7 to 3.15 mR/h. The room is posted with a sign reading “Caution-Radioactive Materials.” What would be the ideal solution?

Place absorbent paper over the spill and close the room until the activity has decayed

A technologist has 500 mrem registered on his ring badge in 1 month. What should be done to decrease exposure in the future?

Use lead pigs and syringe shields when preparing radiopharmaceuticals

OSHA requires that personnel exposure records be provided to employees:

Annually

A room containing a Co-57 sheet source is posted with a sign reading “Caution-Radioactive Materials.” The exposure rate measured next to the source is 5.2 mR/h. What should be done?

Store the source in a leaded container

A technologist discovers that a patient in the room next to a radioiodine therapy patient will receive 2.5 mrem/h when lying in his bed against the shared wall. What should be done?

Move the bed to the other side of the room

What is the dose rate limit at the surface of a package bearing a DOT Class I White label?

0.5 mR/h

A type A package bears a DOT Class II Yellow Radioactive label, has a transport index of 0.8, and contains 10 mCi of ¹¹¹In oxine. What is the exposure rate at 3 ft from the package?

0.8 mR/h

The doorway to the nuclear medicine reception area should be posted with:

None of the above

Which of the following steps would not decrease a technologist’s chances of internal exposure to radiation?

Wearing gloves during injection of radiopharmaceuticals

Tools for measuring personal exposure to radiation include all of the following except:

Geiger-Muller counter

Which of the following must be done during disposal of a carton in which a shipment of I-131 was received?

Radioactive labels must be removed or obliterated

If the lead HVL for Tc-99m is 2.6 mm and a lead shield containing Tc-99m eluate is 13 mm thick, what will the exposure rate be from the shielded vial if the unshielded vial had a rate of 100 mR/h?

3.1 mR/h

Reports of area surveys must include all of the following except:

List of isotopes used in the area

A technologist is working in a hot lab where the exposure rate is 20 mR/h. What sign should be on the door?

Caution: Radiation Area

If a technologist sits 2 ft away from a generator and the dose rate at his chair is 15 mrem/h, what will the dose rate be if he moves his chair 4 ft from the generator?

3.75 mrem/h

A misadministration must be:

All of the above

Which of the following is not a misadministration?

When the correct dose of In-111 oxine for cisternogram is injected intravenously

Which of the following must be kept for 5 years?

Records of misadministrations

Records of Mo-99 breakthrough in Tc-99m eluate must be kept for:

3 years

A pregnant technologist receives 350 mrem during her pregnancy according to a film badge worn at waist level. Has the NRC dose limit for the fetus been exceeded?

No

What is the best choice for disposal of a vial containing 27 mCi of Tc-99m in 2 ml of liquid?

Store until decayed to background

Which of the following materials is sufficient for shielding a therapeutic dose of Y-90 ibritumomab tiuxetan?

Lucite

Any patient who is treated with Y-90 ibritumomab tiuxetan must be hospitalized for at least 24 h

False